If any one have made any app to user REST API to sync wit iPAD or Iphone or any mobile.
I need to store the data in sqlite in the device and then sync.
can any one guide me how can this be done my server is raspberry pi 3 b+
You can use the iOS Kit Encryption from @ChristianSchmitz : https://www.monkeybreadsoftware.de/xojo/EncryptionKit/
There are links to lots of resources for creating and consuming REST web services with Xojo here: